Fraction of carbon atoms locked in eVSGs relative to the carbon in the PAHs, feVSG, versus UV field intensity, G0. Data points and the correlation have been taken from Pilleri et al. (2012). We have highlighted the data points for the PDRs in the reflection nebulae NGC 7023 and NGC 2023 for comparison purposes with IC 63. The data point IC 63(P) corresponds to the estimate obtained by Pilleri et al. (2012), which assumed a G0 = 1100 corresponding to the 650 Draine fields published in Jansen et al. (1994).
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